I have just finished developing a Fritzing part for this shield.
I'm actually quite impressed with this part (If I don't say so myself). Firstly, in the breadboard view, the part is on the same layer as the breadboard so you can put a mini breadboard on top of it just like in real life.
In the schematic view, only the connectors are shown so that you can design real circuit schematics without the protoshield part getting in the way.
In the PCB view, it is a bare Arduino shield so that you can design your own shield layout.
I've released this under the MIT licence, so enjoy. Let me know if you strike any problems.
[Update 27/2/14 - Replaced the attached file with a new version that fixes allignment problems in the schematic view]